.grid {
	overflow: hidden;
	position: relative;
	float: left;
}

.grid img {
	width: 100%;
	height: 100%;
}

.word {
	display: block;
	position: absolute;
	top: 0;
	z-index: -1;
	width: 100%;
	height: 100%;
}

.grid:hover .control{
	display: block;
}

.control {
	display: none;
	position: absolute;
	top: 0;
	z-index: 999;
	width: 100%;
	background: rgba(0,0,0,0.2);
}

.change_btn {
	display: block;
	width: 20%;
	margin: 10px;
	padding: 10px;
	text-align: center;
	color: #fff;
	background: #000;
	cursor: pointer;
}
.rollLine {
	width: 50%;
	display: block;
	position: absolute;
	top: 0;
	left: 30%;
	margin: 20px;
	color: #000000;
	cursor: pointer;
}
